The Big7Kits Big 7 Battery Cable Kit is a complete electrical system upgrade designed to replace old, worn-out factory battery cables on early 4Runner platforms. Decades of heat, corrosion, and environmental exposure take a toll on factory wiring—this kit restores proper current flow for stronger starts, improved charging, and more reliable electrical performance.
This isn’t just a basic “Big 3” upgrade. It’s a true Big 7, engineered to exceed factory capabilities and prepare your 4Runner for future electrical demands.
Important Note
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Big 7 upgrade: Improves current capacity for alternator output, battery grounds, starter, and fuse relay circuits.
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Beyond Big 3: Includes additional leads for the starter and fuse relay box, plus an external fuse to avoid overloading factory wiring.
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Pure copper: Uses SAE-approved fine-strand pure copper cable—no copper-clad aluminum (CCA).
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Crimp quality: Solid copper lugs are crimped using an electromechanical crimping machine for maximum conductivity.
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Environmental seal: Marine-grade heat shrink meets MIL-I-23053/4 standards for corrosion resistance.
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Battery terminals: Includes military-style corrosion-resistant battery connections.
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Fuse protection: Includes ANL fuse and fuse holder for safe high-current routing.
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Ease of install: All cable ends are clearly labeled for straightforward installation.
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Alternator: Does not require a larger alternator—works perfectly with stock systems.
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Reliability: Helps resolve electrical issues caused by degraded factory wiring.
Why Upgrade to Big 7
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Starting power: Reduces voltage drop for faster, more consistent starts.
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Charging efficiency: Improves battery charging performance and stability.
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Electrical reliability: Eliminates many common electrical gremlins found in older vehicles.
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Future-ready: Prepares your 4Runner for accessories like winches, lights, inverters, or audio upgrades.
Cable Size Options
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2 GA: Ideal for stock vehicles or mild electrical upgrades.
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1/0 GA: Recommended if you plan to add accessories later and want to future-proof your system.
Specifications
Package Contents
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Cables: Big 7 upgraded battery cable set
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Terminals: Military-style battery connections
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Protection: ANL fuse and fuse holder
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Labeling: Pre-labeled cable ends for easy installation
Vehicle / Fitment
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Fits: Toyota 4Runner
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Years: 1984–1989
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Application: Factory battery cable replacement and electrical system upgrade
